linux-ext4 - Re: Ext4: Buffered random writes performance regression with dioread

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Message-ID: <20220921044419.epojssm3g4j3qkup@riteshh-domain>
Date:   Wed, 21 Sep 2022 10:14:19 +0530
From:   "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To:     hazem ahmed mohamed <hazem.ahmed.abuelfotoh@...il.com>
Cc:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "tytso@....edu" <tytso@....edu>,
        "adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Mohamed Abuelfotoh, Hazem" <abuehaze@...zon.com>
Subject: Re: Ext4: Buffered random writes performance regression with
 dioread_nolock enabled

On 22/09/19 04:18PM, hazem ahmed mohamed wrote:
> Hey Team,
> 
> 
> 
> I am sending this e-mail to report a performance regression that’s
> caused by commit 244adf6426(ext4: make dioread_nolock the default) , I
> am listing the performance regression symptoms below & our analysis
> for the reported regression.
> 

Although you did mention you already tested on the latest kernel too and there
too you saw a similar performance regression.
But no harm in also double checking if you have this patch [1]. 
This does fixes a similar problem AFAIU.


[1]: https://lore.kernel.org/linux-ext4/20200520133119.1383-1-jack@suse.cz/

-ritesh